Roy Smith writes:

One of the advantages of masturbation is that you can't get AIDS from it.
That hardly makes it a complete substitute for a real person of the
opposite gender.

In surveys I've seen, many people have said that they masturbate
precisely because it doesn't carry the risk of STDs that sexual
intercourse has. And supposedly masturbation produces more intense
orgasms than intercourse as well. While these parallels are not
completely relevant to flight simulation, they do illustrate why
simulation is sometimes preferable to reality. Certainly this is the
case when it comes to dire emergencies and accidents--whence the
popularity of simulators in flight training.

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